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投稿时间：2011-03-18 修订日期：2011-03-26
投稿时间：2011-03-18 修订日期：2011-03-26
中文摘要: 2011年2月环流特征如下：北半球高纬度地区为单一极涡，中心偏向西半球，强度较常年同期偏强，欧亚中高纬呈现4波型，副高强度偏弱，南支槽活动偏弱。2月，全国平均降水量为11.4 mm，比常年同期偏少4.9 mm。上、中旬，我国北方地区处于高压脊控制，华北、黄淮气象干旱持续发展，月底，随着环流形势的调整，上述地区干旱得到有效缓解。2月全国平均气温为-1.2 ℃，比常年同期偏高1.7 ℃。2月有2次冷空气袭击我国大部地区，中东部部分地区遭遇大雾天气。
中文关键词: 冷空气，干旱，大雾
Abstract:The following are the main characteristics of the general atmospheric circulation in February 2011. There is a stronger polar vortex center in the Northern Hemisphere than normal years. The circulation presents a four wave pattern in middle high latitudes. The subtropical high is weaker than normal years. The south branch trough is slightly weaker than normal years. The monthly mean precipitation is 11.4 mm, and is 4.9 mm less than normal. Northern China is under control by ridge in early and mid February. In North China and Huang Huai Plain etc., drought increases until the end of the month to get relief. The monthly mean temperature is -1.2 ℃, and is 1.7 ℃ higher than normal. There were two cold air processes affecting most areas of China. Part of the middle and east of China suffered from fog disasters.
keywords: cold air, drought, fog
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基金项目:国家自然科学基金青年基金资助项目（40805021）资助
| Author Name | Affiliation |
| LIU Yi | National Meteorological Centre, Beijing 100081 |
| HUANG Wei | National Meteorological Centre, Beijing 100081 |
引用文本：
刘一,黄威,2011.2011年2月大气环流和天气分析[J].气象,37(5):639-644.
LIU Yi,HUANG Wei,2011.Analysis of the February 2011 Atmospheric Circulation and Weather[J].Meteor Mon,37(5):639-644.
刘一,黄威,2011.2011年2月大气环流和天气分析[J].气象,37(5):639-644.
LIU Yi,HUANG Wei,2011.Analysis of the February 2011 Atmospheric Circulation and Weather[J].Meteor Mon,37(5):639-644.